Outcome or subgroup	Studies	Participants	Statistical method	Effect estimate
3.1 Use of any contraception	1	1908	Risk Ratio (M‐H, Random, 95% CI)	1.49 [0.81, 2.75]
3.1.1 regular use	1	954	Risk Ratio (M‐H, Random, 95% CI)	1.90 [1.71, 2.10]
3.1.2 ever use	1	954	Risk Ratio (M‐H, Random, 95% CI)	1.17 [1.12, 1.22]
3.2 Condom use	1	954	Risk Ratio (M‐H, Random, 95% CI)	1.14 [1.09, 1.19]